Water-heating and steam-generating boiler



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Patented Apr. 13, 1926.

UNITED STATES ALFRED WILLIAM BENNIS, 01E BOLTON, ENGLAND.

WATER-HEATING AND STEAK-GENERATING BOILER.

Application filed August 8, 1925. Serial No. 47,928.

To all whom it may concern:

Be it known that I, ALFRED WILLIAM BENNIS, a subject of the King of Great Britain, residing in Bolton, in the county of Lancaster and Kingdom of England, have invented certain new and useful Improvements in Water-Heating and Steam-Generating Boilers, of which the following is a specification.

The present invention relates to improvements in water heating and steam generating boilers.

According to the present invention a set or a number of sets of water heating or steam generating tubes are arranged intermediate between a lower heating element in the form of a stationary or moving grate, such as a chain grate, and an upper heating element, such as a pulverized gaseous or liquid fuel jet or jets. 1

By this means the lower heating element in the base of the furnace is protected from the intense heat of combustion of the pulverized, gaseous or liquid fuel and further the tubes provided according to my invention will receive the heat from both heating elements at the time or times when both the upper and lower heating elements are operated in unison.

'The invention 15 more particularly described with reference to the accompanying diagrammatic drawing, in which a travelling chain grate 1 is supplied with fuel to form the lower heating element. The design of the lower grate forms no part of the present invention andmay be a stationary or -moving grate of any type suitable for the firing of steam boilers.

A number of sets of water heatin or steam generating tubes 2 are, located a ove a combustion chamber 3 of the grate 1- while 'one or more pulverized gaseous or liquid fuel jets 4 are provided projecting such fuel into a combustion chamber 5 and are located above the tubes 2. The latter are thus situated between a pulverized, gaseous or liquid fuel combustion chamber 5 and a chain grate lower combustion chamber 3, and'in conse uence the tubes 2 can receive heat from th heating elements, while the grate l is partly protected by the tubes 2 from the intense heat given off in the chamber 5. The intermediate water heating or steam generating tubes 2 may form the whole of the water heating and steam generatin surface but it is preferred that such tu es 2 form only part of theheating and generating surface as shown in the drawing. The intermediate tubes 2 are connected to headers 8 through which the heated water or steam circulates from and to drums or headers 9, further drums l0, tubes 11, drum 12, headers 13, and tubes 14 or headers 15 and tubes 16. Gases of combustion passing upward from the grate 1 or the jet or jets 4 heat the contents of the tubes 16, 14, 11.

'If desired, one or more pipes 18 of the heating system may be situated at the side of the grate 1.

Although according to the diagrammatic drawing, a single passage is provided for the gases of combustion to contact with the irtermediate steam generating tubes, a double or multiple pass can be used.

"After passing through the last set of, tubes the gases of combustion may pass to an economizer 17 or air heater by means of and adapted to receive heat on the upper sides of the tubes from the fuel jet and on the lower sides of the tubes from the furnace grate.

2. A water heating or steam generating boiler comprising in combination a combustion chamber, a fuel jet arranged in the roof of the combustion chamber, a furnace grate situated at the base of the combustion chamber, a bank of tubes situated intermediate the fuel jet and the furnace grate and adapted to receive heat on the upper sides of the tubes from the fuel jet and on the lower sides of the tubes from the furnace grate and a number of further banks of tubes situated in the path of the combined gases of combustion from the fuel jet and the furnace grate.

In witness whereof, signed my name this 22nd day of July, 1925.

ALFRED WILLIAM BENNISQ I have hereunto 

